From personal experience being an **executive** cut kind of guy, that's the way a lot of shirts fit because of the corpulence of the ^neck, shoulders and the upper chest pull the shirt up that way. Unless I were to get bespoke shirts, it's very likely a large majority of my shirts are going to be like that.
**Point of Information: Executive Cut used to be called "Portly." But I figure they changed it because we "portly" people didn't like being called "portly."
^ That actually brings up a story. In October 2017 I had my thyroid taken out due to cancer. My sister came in to help me during the post-surgical period. On a follow-up with the surgeon, he seemed to imply that the surgery had taken longer than usual. I asked him about it. He said I had a short, thick neck which made it more difficult.
A month later at Thanksgiving I had traveled home. My sister was there. I was relating what the surgeon said. My sister said yes he told me that at the time. I think she didn't tell me because she was trying to spare my feelings. 🤭🤭